Harrow-tooth



G. A. LAKE.

HARROW TOOTH.

(No Model.)

No. 396,093. Patented Jan. 15, 1889.

WI TJV ESSES flttorney J UNITED STATES GEORGE A. LAKE, OE

PATENT FFICE.

SHERMAN, MICHIGAN.

HARROW-TOOTH;

SPECIFICATION forming part of Letters Patent No. 396,093, dated January 15, 1889.

Application filed June 29, 1888.

To all whom it may concern.-

Be it known that I, GEORGE A. LAKE, a citizen of the United States, residing at Sherman, in the county of \Vexford and State of Michigan, have invented new and useful Improvements in Harrow-'leeth, of which the follow- 'ing is a specification.

The invent-ion relates to improvements in harrows, referring particularly to the formation of the teeth; and it consists in the construction and novel combination of parts hereinafter described, illustrated in the d rawings, and pointed out in the appended claim.

In the drawings, Figure l is a part of a barrow-frame with the teeth attached to the under surfaces of the rails thereof. Fig. 2 is a similar view with the teeth attached to the upper surfaces of the rails thereof. Fig. 3 is a perspective view of a tooth detached.

The principal object of the invention is, while furnishing a spring-tooth to a harrow, to prevent the frame thereof from sinking at any point to the surface of the ground by the entire penetration of the teeth in the soil.

Referring to the drawings by letter, A designates a part of a rail of a harrow-frame having the tooth B attached thereto, and to either the upper or lower surface thereof, by bolts, staples, or other suitable means. The upper end, C, of the tooth passes either under or over the rail, and from said end the tooth makes nearly a complete circle, extending Serialllo. 278,532. (No model.)

frontward, upward, rearward, and downward to a point, D, sufficiently below the rail. From the point D the tooth curves rearward and downward in a sigmoid bend around the point E, whence it curves forward and downward to its lower end, F.

It is evident that the circular bend makes the tooth a complete spring, and that the lower part, c, of the sigmoid bend forms a curved shoulder with the part below, so that when the tooth penetrates the soil up to said shoulder the latter will rest on the soil and prevent thefurther penetration of the tooth, preventing any part of the harrmv-frame from descemling to the ground.

Having described my invention,'l claim The combination,with a harrow-frame,of the curved spring-teeth B, each of which has an upper nearly circularlybent portion, a downwardly and froutwardly curving lower end, and a curved shoulder above said lower end, whereby the teeth are prevented from entering the soil above said shoulders, and the frame is prevented from descending to the ground at any point, substantially specified.

In testimony that I claim the foregoing as my own I have hereto at'tixed my signature in presence of two witnesses.

GEORGE'A. LAKE.

lVitn esses: I

HENRY T. SMITH,

J. H. WHEELER. 

